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In the figure given below a bar magnet m...

In the figure given below a bar magnet moving towards the right or left includes an `emf` in the coii `(1)`and `(2)` .Find giving reason thedirections of the induced currents through the resistors `AB` and `CD` when the magnet is moving `(a)` towards the right and `(b)` towards the left

Text Solution

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(a)When the magnet is moved towards right, the right end of coil `(1)` develps `S`-polarity and left end of coil `(2)` also develops south polarity i.e., current in both coils flow anticlockwise, in coil `(1)` current flows from `A` to `B` while in coil `(2)`,current flows from `D` to `C`
(b)When the magnet is moved towards left, the right end of coil `(1)` develps `N`-polarity and left end of coil `(2)` also develops `N`- polarity i.e., current in both coils flow clockwise, in coil `(1)` current flows from `B` to `A` while in coil `(2)`,current flows from `C` to `D`
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Knowledge Check

  • When a magnet is moved towards a coil the direction of induced current is clockwise. If the magnet is moved away from the coil, the direction of induced current will be

    A
    clockwise
    B
    anticlockwise
    C
    zero
    D
    any direction

  • The north pole of a bar magnet is moved swiftly downward towards a closed coil and then second time it is raised upwards slowly. The magnitude and direction of the induced currents in the two cases will be of

    A
    `{:("First case",,"Second case"),("Low value clockwise",,"Higher value anticlockwise"):}`
    B
    `{:("First case",,"Second case"),("Low value clockwise",,"Equal value anticlockwise"):}`
    C
    `{:("First case",,"Second case"),("Higher value clockwise",,"Low value clockwise"):}`
    D
    `{:("First case",,"Second case"),("Higher value anticlockwise",,"Low value clockwise"):}`

  • When a magnet is being moved towards a coil, the induced emf does not depend upon__

    A
    the number of turns of the coil
    B
    the motion of the magnet
    C
    the magnetic moment of the magnet
    D
    the resistance of the coil